CVE-2020-25643
No exploitation reported by the sources we read.
- Published2020-10-06
- Fixed in5.8.12 · 5.4.68 · 4.19.148 · 4.14.200 · 4.9.238 · 4.4.238
- WeaknessCWE-20
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
A flaw was found in the HDLC_PPP module of the Linux kernel in versions before 5.9-rc7. Memory corruption and a read overflow is caused by improper input validation in the ppp_cp_parse_cr function which can cause the system to crash or cause a denial of service. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Timeline
dates in UTC- 2020-10-0614:15CVE publishedNVD
Observed activity
isMalicious corpus · updated 2026-10-23 21:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-25643?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-25643?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 5.x | ≥ 5.5, < 5.8.12 | 5.8.12 | NVD |
| 5.4 | ≥ 4.20, < 5.4.68 | 5.4.68 | NVD |
| 4.x | ≥ 4.15, < 4.19.148 | 4.19.148 | NVD |
| 4.x | ≥ 4.10, < 4.14.200 | 4.14.200 | NVD |
| 4.x | ≥ 4.5, < 4.9.238 | 4.9.238 | NVD |
| 4.4 | ≥ 2.6.29, < 4.4.238 | 4.4.238 | NVD |
| 5.9 | = 5.9.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 9.0 | = 9.0 | no fix published | NVD |
| 10.0 | = 10.0 | no fix published | NVD |
| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 15.1 | = 15.1 | no fix published | NVD |
| 15.2 | = 15.2 | no fix published | NVD |
3 more products in the sources.
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Distribution builds and vendor advisories
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- kernel-tools-libs-develAlmaLinux:8all versions · fixed in 4.18.0-305.el8
Fix
- Update Linux linux kernel to 5.8.12 · 5.4.68 · 4.19.148 · 4.14.200 · 4.9.238 · 4.4.238
Advisories and patches
- bugzilla.redhat.comPatch
- git.kernel.orgPatch
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- Published
- 2020-10-06
- Last Modified
- 2026-06-17
- NVD status
- Modified
Frequently asked questions
What is CVE-2020-25643?
Is CVE-2020-25643 actively exploited?
What is the CVSS score for CVE-2020-25643?
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.